Based on the theoretical study, automatic washing machines were coin-operated control system design and development.
在上述理论研究的基础上，进行了投币式自动洗衣机控制系统的设计和研制。
Based on the theoretical study, automatic washing machines were coin-operated control system design and development.
在上述理论研究的基础上，进行了投币式自动洗衣机控制系统的设计和研制。
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